Apparatus for making test samples of slivers and the like



P. LATSCH July 2, V 1929.

APPARATUS FOR MAKING TEST SAMPLES OF SLIVERS AND THE LIKE Filed Sept. 10, 1 927 Patented July 2, 1929. I

UNITED STATES PATENT OFFICE.

PAUL LATSGH, F ZURICH, SWITZERLAND. 1

APPARATUS FOR MAKING TEST SAMPLES or sLIvEns AND THE LIKE.

Application. filed September 10, 1927, Serial No. 218,639, and in Germany November 1, 1926.

Slivers and rovings of cotton, wool, shoddy, flax or of any other fibre are produced on preparatory machines in. spinning mills and pass through several processes of drawing reducing their size until finally a yarn is produced on the spinning machine.

Those slivers and rovings are somewhat fluffy. For instance, as a card sliver, drawing sliver or comber sliver or in their later and finer state they are very softly twisted, such as slubber, intermediate, speeder and jack-frame rovings.

The slivers and rovings passing through the different processes of reducing or drawing same down in size are subject to unevenness or irregularities in size, sometimes called and. better known as being out. This irregularity and unevenness in the size of the slivers and rovings are harmful and un desirable as they have a decided effect on the quality and evenness of the yarn finally produced therefrom.

To detect these cuts or irregularities in the slivers or rovings on the preparatory machine while in operation is almost impossible 011 account of the fast speed at which they are produced. It is also almost i mpossible to see these irregularities in slze by putting those slivers or rovings on a blackboard as their degree of density is not the same in all sections.

However, if one inserts a hard twist on both ends of a certain length of those slivers or rovings under a certain degree of tension then those slivers or rovings receive on all sections a uniform radial pressure and the irregularities or cuts will then be readily detected by the naked eye.

Hanging now in the middle of the hard twist sliver or roving while keeping it under tension, a heavy weight and bringing together both ends of the certain length of twisted roving or sliver in such a way to allow this weight to hang free. The sliver or roving will twist itself to a two-ply balanced strand. 1

Such a double twisted length of a sliver or roving is hereafter called twist sample. When put on a dark board or background those twist samples permit a sure and correct examination as to their uniformity and show either a correct or faulty working or setting of said preparatory machinery which produced them.

These twisted samples can be filed away and referred to at any time for comparison and when satisfactory can be adopted as a standard to go by for properly adjusting the preparatory machinery.

To produce those twist samples by hand is too tedious and not satisfactory. This double twisting method is practically unknown or unused today in cotton manufacturing circlesl Only very few experts in certain mills employ it and only then in a very primitive way do they double twist rovings or slivers for uniformity tests.

The purpose of the above described inven- 01011 is an apparatus which permits twist samples to be made quickly and accurately and to establish this double twist method for testing slivers or rovings as a permanent one which can be done by different persons correctly and at a great saving of time.

The accompanying drawing illustrates apparatus of the invention and in the drawing Figure 1 is an elevation partly in vertical section, and

Figs. 2 and 3 are skeleton sketches to illustrate the working of the apparatus.

1 is a frame which can be fastened on a wall or post. In this frame is housed shaft 3 on one end of which is crank 2. Mounted on shaft 3 are also two bevel gears 4, which intermesh with two bevel gears situated closely together on vertical shafts 6, also housed in frame 1. Both shafts 6 have 011 their lower ends spring controlled fasteners or clips 7. Crank 2 by means of gears 4 and 5 turns shaft- 6 and fasteners or clips 7 in the same direction and at the same time.

The operation of the above described apparatus is as follows:

The sliver or roving 8 to be tested of approximately two yards length is fastened at both its ends in fasteners or clips 7 and forms a loop hanging downward over the hook 9 to which hook is fastened weight 10 which rests on a platform.

Now, turning the fasteners or clips 7 by means of crank 2 and gears i and 5, the slivers or rovings 8 receive twist. It contracts itself and lifts the weight 10 shown in Fig. 2, this weight 10 holding the sliver or roving 8 under tension. The weight 10 is adjustable for certain size slivers or rovings. The weight 10 slides upward along a guide 11, which prevents it from turning.

After a certain amount of twist has been reference. 7 It will arttowhichthe invention relates that modi ,fioatio'ns may be made in details of eonstrue- .tionaa' 'd matters oit-mere form Without departing from the spirit of the invention a which is notxlimited to such matters or otherinserted in the sliver or roving 8, varying to its size, theguide ll is swung aside and the two lengths of sliver or rovin 8 twist themselves together into a two-ply balanced moved it can be examined on a dark board or background and filed away for future be obvious to those skilled in the wise than the prior art and the appended claim may require.

I claim:

Apparatus for making test samples of slivers and the like comprising clips arranged close together and adapted to receive the ends of a vertically dependent loop or sliver, means for simultaneously rotating the clips on their vertical axes in the same direction to put twist into each leg of the loop, a Weight adapted to be hung directly on the loop to put tension on the sliver, and guiding means for the weight adapted to prevent the rotation thereof until twist is put into the legs of the loop and to there after free the Weight for rotation.

PAUL LATSCH. 

